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An AC interference study was conducted in 2015 after the installation of a 240 kV powerline. Risk of AC corrosion was indicated. Describe are both the challenges and the solutions, including the design of a temporary mitigation system allowing energization of the powerline at reduced power.
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An overview of the challenges encountered within the Wafra Oilfield during a long, unscheduled shutdown - along with chemical treatment solutions developed for the preservation of the downhole casing, tubing and pump assemblies left in place.
Protecting mechanisms of a new generation of activated zinc primers with enhanced protection vs inorganic zinc rich primers. Performance properties have been proven with results from different corrosion tests.
Very thick polyurethane coatings are used to provide corrosion protection for water pipelines that must be placed below ground and then may be exposed to ground water. Occasionally there are construction delays and pipe sections remain above ground for extended periods before installation. Under these conditions, atmospheric conditions and exposure to solar UV light cause the coatings to lose gloss and become yellow. These changes can be very obvious and thus raise concerns that the corrosion protective qualities of the coating have also similarly diminished.
This work aims to understand and characterize intergranular corrosion phenomena in order to develop and optimize an engineering test to determine the propagation kinetics of intergranular corrosion defects in a 2024-T351 aluminium alloy.
The bulk characteristics of Chemically Bonded Phosphate Ceramic (CBPC) coating was investigated for marine bridge application in alternate wet and dry exposure. Assessment of possible bulk coating degradation was made by physical testing, Mercury Intrusion Porosimetry (MIP) and electrochemical techniques. The bulk coating material was observed to become chalky and in some cases form cracks when exposed to alternate wet and dry conditions. Cohesive strength appeared to degrade.
This paper reviews a theoretical background of buffer solutions for stainless steel oil country tubular goods materials at laboratory corrosion test, and then the concept is applied to NACE-TM0177-based solution and modified solutions.
Wastewater treatment plant clarifier environments present challenges for selecting materials of construction. Coated carbon steel, hot-dip galvanized steel, and stainless steel are most commonly specified for new or refurbished clarifier mechanisms, and all have their advantages and disadvantages with regard to achieving the intended design life.
The application of paints and other coatings over joints, gaps, and fasteners is universal in industrial applications. Where substrate flexing occurs, such as in aerospace and automotive use, an understanding of strains within such systems is essential. Results of finite-element analysis of various two- and three-dimensional models of coated joints are presented here.
A nanoparticle enriched epoxy primer (NPE-ZRP) and conventional zinc-rich primer (ZRP) were tested to identify the benefits of nanoparticles for coating durability and corrosion mitigation. An intentional defect was introduced to the coating to expose the steel substrate. Samples were exposed to open circuit potential (OCP) and -1100 mVSCE polarization regime for 30 days in 3.5% (w/w) NaCl aqueous solution.
Mechanisms of corrosion and cathodic delamination resulting from the cracking of paint in a water ballast tank environment and what may be expected in the corrosive environment. This will be based on the concept of a thermodynamic barrier existing at the coating/steel interface.
In this paper exhaustive field study trials to monitor the pipe to soil potential over an extended time period and subsequent analysis of data has been discussed with reference to the critical Combined Cathodic and Anodic Interference phenomena observed on pipelines.